1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/types.h> 3 #include <linux/init.h> 4 #include <linux/interrupt.h> 5 #include <linux/mm.h> 6 #include <linux/slab.h> 7 #include <linux/spinlock.h> 8 #include <linux/zorro.h> 9 #include <linux/module.h> 10 11 #include <asm/page.h> 12 #include <asm/pgtable.h> 13 #include <asm/amigaints.h> 14 #include <asm/amigahw.h> 15 16 #include "scsi.h" 17 #include "wd33c93.h" 18 #include "gvp11.h" 19 20 21 #define CHECK_WD33C93 22 23 struct gvp11_hostdata { 24 struct WD33C93_hostdata wh; 25 struct gvp11_scsiregs *regs; 26 }; 27 28 static irqreturn_t gvp11_intr(int irq, void *data) 29 { 30 struct Scsi_Host *instance = data; 31 struct gvp11_hostdata *hdata = shost_priv(instance); 32 unsigned int status = hdata->regs->CNTR; 33 unsigned long flags; 34 35 if (!(status & GVP11_DMAC_INT_PENDING)) 36 return IRQ_NONE; 37 38 spin_lock_irqsave(instance->host_lock, flags); 39 wd33c93_intr(instance); 40 spin_unlock_irqrestore(instance->host_lock, flags); 41 return IRQ_HANDLED; 42 } 43 44 static int gvp11_xfer_mask = 0; 45 46 void gvp11_setup(char *str, int *ints) 47 { 48 gvp11_xfer_mask = ints[1]; 49 } 50 51 static int dma_setup(struct scsi_cmnd *cmd, int dir_in) 52 { 53 struct Scsi_Host *instance = cmd->device->host; 54 struct gvp11_hostdata *hdata = shost_priv(instance); 55 struct WD33C93_hostdata *wh = &hdata->wh; 56 struct gvp11_scsiregs *regs = hdata->regs; 57 unsigned short cntr = GVP11_DMAC_INT_ENABLE; 58 unsigned long addr = virt_to_bus(cmd->SCp.ptr); 59 int bank_mask; 60 static int scsi_alloc_out_of_range = 0; 61 62 /* use bounce buffer if the physical address is bad */ 63 if (addr & wh->dma_xfer_mask) { 64 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff; 65 66 if (!scsi_alloc_out_of_range) { 67 wh->dma_bounce_buffer = 68 kmalloc(wh->dma_bounce_len, GFP_KERNEL); 69 wh->dma_buffer_pool = BUF_SCSI_ALLOCED; 70 } 71 72 if (scsi_alloc_out_of_range || 73 !wh->dma_bounce_buffer) { 74 wh->dma_bounce_buffer = 75 amiga_chip_alloc(wh->dma_bounce_len, 76 "GVP II SCSI Bounce Buffer"); 77 78 if (!wh->dma_bounce_buffer) { 79 wh->dma_bounce_len = 0; 80 return 1; 81 } 82 83 wh->dma_buffer_pool = BUF_CHIP_ALLOCED; 84 } 85 86 /* check if the address of the bounce buffer is OK */ 87 addr = virt_to_bus(wh->dma_bounce_buffer); 88 89 if (addr & wh->dma_xfer_mask) { 90 /* fall back to Chip RAM if address out of range */ 91 if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) { 92 kfree(wh->dma_bounce_buffer); 93 scsi_alloc_out_of_range = 1; 94 } else { 95 amiga_chip_free(wh->dma_bounce_buffer); 96 } 97 98 wh->dma_bounce_buffer = 99 amiga_chip_alloc(wh->dma_bounce_len, 100 "GVP II SCSI Bounce Buffer"); 101 102 if (!wh->dma_bounce_buffer) { 103 wh->dma_bounce_len = 0; 104 return 1; 105 } 106 107 addr = virt_to_bus(wh->dma_bounce_buffer); 108 wh->dma_buffer_pool = BUF_CHIP_ALLOCED; 109 } 110 111 if (!dir_in) { 112 /* copy to bounce buffer for a write */ 113 memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr, 114 cmd->SCp.this_residual); 115 } 116 } 117 118 /* setup dma direction */ 119 if (!dir_in) 120 cntr |= GVP11_DMAC_DIR_WRITE; 121 122 wh->dma_dir = dir_in; 123 regs->CNTR = cntr; 124 125 /* setup DMA *physical* address */ 126 regs->ACR = addr; 127 128 if (dir_in) { 129 /* invalidate any cache */ 130 cache_clear(addr, cmd->SCp.this_residual); 131 } else { 132 /* push any dirty cache */ 133 cache_push(addr, cmd->SCp.this_residual); 134 } 135 136 bank_mask = (~wh->dma_xfer_mask >> 18) & 0x01c0; 137 if (bank_mask) 138 regs->BANK = bank_mask & (addr >> 18); 139 140 /* start DMA */ 141 regs->ST_DMA = 1; 142 143 /* return success */ 144 return 0; 145 } 146 147 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, 148 int status) 149 { 150 struct gvp11_hostdata *hdata = shost_priv(instance); 151 struct WD33C93_hostdata *wh = &hdata->wh; 152 struct gvp11_scsiregs *regs = hdata->regs; 153 154 /* stop DMA */ 155 regs->SP_DMA = 1; 156 /* remove write bit from CONTROL bits */ 157 regs->CNTR = GVP11_DMAC_INT_ENABLE; 158 159 /* copy from a bounce buffer, if necessary */ 160 if (status && wh->dma_bounce_buffer) { 161 if (wh->dma_dir && SCpnt) 162 memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer, 163 SCpnt->SCp.this_residual); 164 165 if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) 166 kfree(wh->dma_bounce_buffer); 167 else 168 amiga_chip_free(wh->dma_bounce_buffer); 169 170 wh->dma_bounce_buffer = NULL; 171 wh->dma_bounce_len = 0; 172 } 173 } 174 175 static struct scsi_host_template gvp11_scsi_template = { 176 .module = THIS_MODULE, 177 .name = "GVP Series II SCSI", 178 .show_info = wd33c93_show_info, 179 .write_info = wd33c93_write_info, 180 .proc_name = "GVP11", 181 .queuecommand = wd33c93_queuecommand, 182 .eh_abort_handler = wd33c93_abort, 183 .eh_host_reset_handler = wd33c93_host_reset, 184 .can_queue = CAN_QUEUE, 185 .this_id = 7, 186 .sg_tablesize = SG_ALL, 187 .cmd_per_lun = CMD_PER_LUN, 188 .dma_boundary = PAGE_SIZE - 1, 189 }; 190 191 static int check_wd33c93(struct gvp11_scsiregs *regs) 192 { 193 #ifdef CHECK_WD33C93 194 volatile unsigned char *sasr_3393, *scmd_3393; 195 unsigned char save_sasr; 196 unsigned char q, qq; 197 198 /* 199 * These darn GVP boards are a problem - it can be tough to tell 200 * whether or not they include a SCSI controller. This is the 201 * ultimate Yet-Another-GVP-Detection-Hack in that it actually 202 * probes for a WD33c93 chip: If we find one, it's extremely 203 * likely that this card supports SCSI, regardless of Product_ 204 * Code, Board_Size, etc. 205 */ 206 207 /* Get pointers to the presumed register locations and save contents */ 208 209 sasr_3393 = ®s->SASR; 210 scmd_3393 = ®s->SCMD; 211 save_sasr = *sasr_3393; 212 213 /* First test the AuxStatus Reg */ 214 215 q = *sasr_3393; /* read it */ 216 if (q & 0x08) /* bit 3 should always be clear */ 217 return -ENODEV; 218 *sasr_3393 = WD_AUXILIARY_STATUS; /* setup indirect address */ 219 if (*sasr_3393 == WD_AUXILIARY_STATUS) { /* shouldn't retain the write */ 220 *sasr_3393 = save_sasr; /* Oops - restore this byte */ 221 return -ENODEV; 222 } 223 if (*sasr_3393 != q) { /* should still read the same */ 224 *sasr_3393 = save_sasr; /* Oops - restore this byte */ 225 return -ENODEV; 226 } 227 if (*scmd_3393 != q) /* and so should the image at 0x1f */ 228 return -ENODEV; 229 230 /* 231 * Ok, we probably have a wd33c93, but let's check a few other places 232 * for good measure. Make sure that this works for both 'A and 'B 233 * chip versions. 234 */ 235 236 *sasr_3393 = WD_SCSI_STATUS; 237 q = *scmd_3393; 238 *sasr_3393 = WD_SCSI_STATUS; 239 *scmd_3393 = ~q; 240 *sasr_3393 = WD_SCSI_STATUS; 241 qq = *scmd_3393; 242 *sasr_3393 = WD_SCSI_STATUS; 243 *scmd_3393 = q; 244 if (qq != q) /* should be read only */ 245 return -ENODEV; 246 *sasr_3393 = 0x1e; /* this register is unimplemented */ 247 q = *scmd_3393; 248 *sasr_3393 = 0x1e; 249 *scmd_3393 = ~q; 250 *sasr_3393 = 0x1e; 251 qq = *scmd_3393; 252 *sasr_3393 = 0x1e; 253 *scmd_3393 = q; 254 if (qq != q || qq != 0xff) /* should be read only, all 1's */ 255 return -ENODEV; 256 *sasr_3393 = WD_TIMEOUT_PERIOD; 257 q = *scmd_3393; 258 *sasr_3393 = WD_TIMEOUT_PERIOD; 259 *scmd_3393 = ~q; 260 *sasr_3393 = WD_TIMEOUT_PERIOD; 261 qq = *scmd_3393; 262 *sasr_3393 = WD_TIMEOUT_PERIOD; 263 *scmd_3393 = q; 264 if (qq != (~q & 0xff)) /* should be read/write */ 265 return -ENODEV; 266 #endif /* CHECK_WD33C93 */ 267 268 return 0; 269 } 270 271 static int gvp11_probe(struct zorro_dev *z, const struct zorro_device_id *ent) 272 { 273 struct Scsi_Host *instance; 274 unsigned long address; 275 int error; 276 unsigned int epc; 277 unsigned int default_dma_xfer_mask; 278 struct gvp11_hostdata *hdata; 279 struct gvp11_scsiregs *regs; 280 wd33c93_regs wdregs; 281 282 default_dma_xfer_mask = ent->driver_data; 283 284 /* 285 * Rumors state that some GVP ram boards use the same product 286 * code as the SCSI controllers. Therefore if the board-size 287 * is not 64KB we assume it is a ram board and bail out. 288 */ 289 if (zorro_resource_len(z) != 0x10000) 290 return -ENODEV; 291 292 address = z->resource.start; 293 if (!request_mem_region(address, 256, "wd33c93")) 294 return -EBUSY; 295 296 regs = ZTWO_VADDR(address); 297 298 error = check_wd33c93(regs); 299 if (error) 300 goto fail_check_or_alloc; 301 302 instance = scsi_host_alloc(&gvp11_scsi_template, 303 sizeof(struct gvp11_hostdata)); 304 if (!instance) { 305 error = -ENOMEM; 306 goto fail_check_or_alloc; 307 } 308 309 instance->irq = IRQ_AMIGA_PORTS; 310 instance->unique_id = z->slotaddr; 311 312 regs->secret2 = 1; 313 regs->secret1 = 0; 314 regs->secret3 = 15; 315 while (regs->CNTR & GVP11_DMAC_BUSY) 316 ; 317 regs->CNTR = 0; 318 regs->BANK = 0; 319 320 wdregs.SASR = ®s->SASR; 321 wdregs.SCMD = ®s->SCMD; 322 323 hdata = shost_priv(instance); 324 if (gvp11_xfer_mask) 325 hdata->wh.dma_xfer_mask = gvp11_xfer_mask; 326 else 327 hdata->wh.dma_xfer_mask = default_dma_xfer_mask; 328 329 hdata->wh.no_sync = 0xff; 330 hdata->wh.fast = 0; 331 hdata->wh.dma_mode = CTRL_DMA; 332 hdata->regs = regs; 333 334 /* 335 * Check for 14MHz SCSI clock 336 */ 337 epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000); 338 wd33c93_init(instance, wdregs, dma_setup, dma_stop, 339 (epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10 340 : WD33C93_FS_12_15); 341 342 error = request_irq(IRQ_AMIGA_PORTS, gvp11_intr, IRQF_SHARED, 343 "GVP11 SCSI", instance); 344 if (error) 345 goto fail_irq; 346 347 regs->CNTR = GVP11_DMAC_INT_ENABLE; 348 349 error = scsi_add_host(instance, NULL); 350 if (error) 351 goto fail_host; 352 353 zorro_set_drvdata(z, instance); 354 scsi_scan_host(instance); 355 return 0; 356 357 fail_host: 358 free_irq(IRQ_AMIGA_PORTS, instance); 359 fail_irq: 360 scsi_host_put(instance); 361 fail_check_or_alloc: 362 release_mem_region(address, 256); 363 return error; 364 } 365 366 static void gvp11_remove(struct zorro_dev *z) 367 { 368 struct Scsi_Host *instance = zorro_get_drvdata(z); 369 struct gvp11_hostdata *hdata = shost_priv(instance); 370 371 hdata->regs->CNTR = 0; 372 scsi_remove_host(instance); 373 free_irq(IRQ_AMIGA_PORTS, instance); 374 scsi_host_put(instance); 375 release_mem_region(z->resource.start, 256); 376 } 377 378 /* 379 * This should (hopefully) be the correct way to identify 380 * all the different GVP SCSI controllers (except for the 381 * SERIES I though). 382 */ 383 384 static struct zorro_device_id gvp11_zorro_tbl[] = { 385 { ZORRO_PROD_GVP_COMBO_030_R3_SCSI, ~0x00ffffff }, 386 { ZORRO_PROD_GVP_SERIES_II, ~0x00ffffff }, 387 { ZORRO_PROD_GVP_GFORCE_030_SCSI, ~0x01ffffff }, 388 { ZORRO_PROD_GVP_A530_SCSI, ~0x01ffffff }, 389 { ZORRO_PROD_GVP_COMBO_030_R4_SCSI, ~0x01ffffff }, 390 { ZORRO_PROD_GVP_A1291, ~0x07ffffff }, 391 { ZORRO_PROD_GVP_GFORCE_040_SCSI_1, ~0x07ffffff }, 392 { 0 } 393 }; 394 MODULE_DEVICE_TABLE(zorro, gvp11_zorro_tbl); 395 396 static struct zorro_driver gvp11_driver = { 397 .name = "gvp11", 398 .id_table = gvp11_zorro_tbl, 399 .probe = gvp11_probe, 400 .remove = gvp11_remove, 401 }; 402 403 static int __init gvp11_init(void) 404 { 405 return zorro_register_driver(&gvp11_driver); 406 } 407 module_init(gvp11_init); 408 409 static void __exit gvp11_exit(void) 410 { 411 zorro_unregister_driver(&gvp11_driver); 412 } 413 module_exit(gvp11_exit); 414 415 MODULE_DESCRIPTION("GVP Series II SCSI"); 416 MODULE_LICENSE("GPL"); 417